Ternary form is a musical structure that consists of three distinct sections, typically labeled as A-B-A. The first section, A, presents a theme or melody, followed by a contrasting section, B, which introduces new material. After the B section, the A section is repeated, creating a sense of return and familiarity. This form is commonly found in various genres, including classical music and popular songs. Composers like Wolfgang Amadeus Mozart and Frédéric Chopin often utilized ternary form to create balance and contrast in their works, making it a fundamental concept in music theory.